astrotours.co

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:1a:5a:6a:3c:a8:7c:a2:0c:45:eb:c5:f4:b4:0a:37:3f:56 was issued on by Let's Encrypt.

This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.


We have idenified some issues with this certificate:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=astrotours.co

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:1a:5a:6a:3c:a8:7c:a2:0c:45:eb:c5:f4:b4:0a:37:3f:56
Serial Number (int): 270304381468606266676864876069603853680470
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 6e:de:be:02:fd:09:db:8b:9c:e9:5d:8c:57:91:f1:fb:9e:af:e1:76
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): d2:40:d8:1d:ec:a6:55:98:5e:3a:19:d6:38:ec:1d:8b:e2:0e:9e:11
Fingerprint (sha256): 58:37:75:97:26:09:6c:d8:38:6f:a8:91:28:29:11:f7:58:43:c7:fa:70:9c:c2:3a:9e:4a:95:80:1b:d4:0c:70

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate astrotours.co

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for astrotours.co

Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication

Extensions

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

astrotours.co

Other certificates including the domain name astrotours.co

(limited to 100 certificates)
astrotours.co
astrotours.co
www.astrotours.co
astrotours.co
www.astrotours.co
astrotours.co
astrotours.co
astrotours.co
www.astrotours.co
astrotours.co
www.astrotours.co
astrotours.co
www.astrotours.co
astrotours.co
astrotours.co
www.astrotours.co
www.astrotours.co
astrotours.co
astrotours.co
astrotours.co
www.astrotours.co
www.astrotours.co
www.astrotours.co
www.astrotours.co
www.astrotours.co
www.astrotours.co
astrotours.co
astrotours.co
www.astrotours.co
astrotours.co
astrotours.co
www.astrotours.co
astrotours.co
astrotours.co
passthru.com
www.astrotours.co
www.astrotours.co
astrotours.co
astrotours.co
astrotours.co
astrotours.co
astrotours.co
www.astrotours.co
astrotours.co

Certificate

The complete raw certificate details for astrotours.co in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqwDDO7CJz449edN8QCA0
1enFJU2MjNyTw8Sw/sts8XUwbEslG93dN+yCV+DrqR0kUpzf1kqLKO8H9q+tmN4A
Z1kpa1q60xqNY6RsE1RRcaBye1WZ2UgCIxNT7haTJcvuP+SyGG59zHLnur9CgnCK
tsn2tdswpGP3lcCte2gg0u2FZxFjtYXD+9OP0/SE7Kz+ro+QLr/xS3JaUd23tpI0
hKGTUThf7oqSlBz3Y1kwDP1nKc/42RFumR9g4yRcPvrfLi5pSsRpiZgOiJjSu6QW
eW3UT6fKa9Km9wBhIvyBtTxzDtqF1B0Nk1uXrnk14W1wbSD2Si9vK7XjEvyjEqaK
1wIDAQAB
-----END PUBLIC KEY-----

ASN.1 decoded

 [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2
 . . . . . . . . [c:0|t:2|false] INTEGER 270304381468606266676864876069603853680470
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt Authority X3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-07-25 21:14:22 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-10-23 21:14:22 +0000 UTC
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'astrotours.co'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption)
 . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 21587126215838916197560521851486823759288581604295381875225057621820107448635323226481091382180324051735710647421958331657614386127681029724366332965809492717731502283472809192477834946274726280403266173461801465241996791662065160555823292922778583804836869541529020161591022804962755311963599037921565893774926371899325605475664508913986147323768847499981019554738724640446875444300804522905223900720717436679366150173308430505861515155455220703549630226476650905335948539029331657504179284000520178823808050084629214865302611286902646438341859086260069052954417362305778417804610141904590486674040582860229747051223
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537

 . . . . . . . . [c:2|t:3|true] ORAddress 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits)
							05a0
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14 (subjectKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							6edebe02fd09db8b9ce95d8c5791f1fb9eafe176
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName a84a6a63047dddbae6d139b7a64565eff3a8eca1
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (99 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ocsp.int-x3.letsencrypt.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://cert.int-x3.letsencrypt.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (17 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'astrotours.co'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.44947.1.1.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007700c1164ae0a772d2d4392dc80ac10770d4f0c49bde991a4840c1fa075164f6336000000164d381e34a0000040300483046022100c8d0acda264be9f24d77c6c150969d69a89186c9bb117049ecba5f0f53e7b3d7022100be2d88041f582ea5886ce7f5d9b371a8408de5bc9e067ba1f013e0be4acb751a007500a4501269055a15545e6211ab37bc103f62ae5576a45e4b1714453e1b22106a2500000164d381e34a000004030046304402200acc91d36c589d2c7e63cb31ef09a319e0e3780d75db65b6c55fe480d536c0cd0220673995847a480d352ec0217798418ef086ed124daf2d5f393167152cd3c1997e
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . [c:0|t:5|false] NULL 
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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